"Knock Knock.""Who's there?""Your local tax assessor. I want to come inside your home to see if we're taxing you enough."

It's no joke. A tax assessor in Davison Township said she needed to go inside homes to do her job. She was emboldened by the Michigan Tax Commission which is encouraging such inspections but the Mackinac Center Legal Foundation says the practice violates the Constitution's Fourth Amendment on search and seizure.